An atom has electronic configuration 2, 8, 7.(a) What is the atomic number of this element?(b) To which of the following elements would it be chemically similar? (Atomic numbers are given in parentheses.)N(7) F(9) P(15) Ar(18)

The position of three elements A, B and C in the Periodic Table are shown below –

Group 16

Group 17

−

−

−

A

−

−

B

C

(a) State whether A is a metal or non-metal.(b) State whether C is more reactive or less reactive than A.(c) Will C be larger or smaller in size than B?(d) Which type of ion, cation or anion, will be formed by element A?

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the Periodic Table. Write the electronic configuration of these two elements. Which of these will be more electronegative? Why?

Chapter 5: Periodic Classification of Elements

NCERT solutions for Class 10 Science Textbook chapter 5 (Periodic Classification of Elements) include all questions with solution and detail explanation.
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Concepts covered in Class 10 Science Textbook chapter 5 Periodic Classification of Elements are Periodic Classification of Elements Introduction, Periodic Classification of Elements Questions, Early Attempts at the Classification of Elements - Dobereiner’s Triads, Early Attempts at the Classification of Elements - Newlands’ Law of Octaves, Mendeleev’s Periodic Table, Achievements of Mendeleev’s Periodic Table, Limitations of Mendeleev’s Classification, The Modern Periodic Table, Position of Elements and Trends in the Modern Periodic Table, Periodic Classification of Elements Introduction, Periodic Classification of Elements Questions, Early Attempts at the Classification of Elements - Dobereiner’s Triads, Early Attempts at the Classification of Elements - Newlands’ Law of Octaves, Mendeleev’s Periodic Table, Achievements of Mendeleev’s Periodic Table, Limitations of Mendeleev’s Classification, The Modern Periodic Table, Position of Elements and Trends in the Modern Periodic Table.

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